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                        第2章：变量
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                        第11章：Date与Math
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                        <h1 id="javascript&#x53D8;&#x91CF;">JavaScript&#x53D8;&#x91CF;</h1>
<h3 id="1&#x58F0;&#x660E;&#x53D8;&#x91CF;">1.&#x58F0;&#x660E;&#x53D8;&#x91CF;</h3>
<pre><code>    data &#x662F;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;,&#x88C5;&#x7740;&#x6570;&#x636E;&#x7684;&#x5BB9;&#x5668;
    var data = 123;
</code></pre><h3 id="2&#x547D;&#x540D;&#x89C4;&#x8303;">2.&#x547D;&#x540D;&#x89C4;&#x8303;</h3>
<p>1.&#x53D8;&#x91CF;&#x7684;&#x540D;&#x79F0;&#x53EA;&#x80FD;&#x7531;&#x5927;&#x5C0F;&#x5199;&#x82F1;&#x6587;&#x5B57;&#x6BCD;&#x3001;&#x6570;&#x5B57;&#x3001;&#x4E0B;&#x5212;&#x7EBF;&#x3001;$&#x7EC4;&#x6210;&#xFF0C;&#x4F46;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x6570;&#x5B57;&#x5F00;&#x5934;</p>
<p>2.&#x5173;&#x952E;&#x5B57;&#x4E0D;&#x53EF;&#x4F7F;&#x7528;&#xFF0C;&#x4F8B;&#x5982;new / var / delete / document / window</p>
<p>3.&#x5C0F;&#x9A7C;&#x5CF0;&#x6CD5;dataNumber&#x3001;&#x5927;&#x9A7C;&#x5CF0;&#x6CD5;DataString&#x3001;&#x4E0B;&#x5212;&#x7EBF;&#x5206;&#x5272;data_array</p>
<p>4.&#x5C3D;&#x53EF;&#x80FD;&#x7684;&#x8BED;&#x4E49;&#x5316;</p>
<h3 id="3&#x53D8;&#x91CF;&#x7C7B;&#x578B;">3.&#x53D8;&#x91CF;&#x7C7B;&#x578B;</h3>
<p>1.&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;</p>
<pre><code>    var str1 = &quot;&#x5B57;&#x7B26;&#x4E32;&quot;;
    var str2 = &apos; &quot;&#x5B57;&#x7B26;&#x4E32;&quot; &apos;;
    var str3 = ` &#x5B57;&#x7B26;&#x4E32; `;            //es6&#x5199;&#x6CD5;
</code></pre><p>2.&#x6570;&#x503C;&#x7C7B;&#x578B;</p>
<pre><code>    var num = 123.456;
</code></pre><p>3.&#x5E03;&#x5C14;&#x7C7B;&#x578B;Boolean</p>
<pre><code>    var bool = true;    //true&#x4E3A;&#x771F; false&#x4E3A;&#x5047;
</code></pre><p>4.null &#x548C; undefined</p>
<pre><code>    var kong1 = null;
    var kong2;
    console.log(kong1);        //null
    console.log(kong2);        //undefined
</code></pre><p>&#x53D8;&#x91CF;&#x672A;&#x5B9A;&#x4E49;&#x65F6;&#xFF0C;&#x53D8;&#x91CF;&#x7684;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;undefined</p>
<p>null&#x662F;&#x9700;&#x8981;&#x6211;&#x4EEC;&#x4E3B;&#x52A8;&#x7684;&#x8BBE;&#x7F6E;&#x8FDB;&#x53BB;&#xFF1B;</p>
<p>undefined&#xFF1A;&#x6709;&#x503C;&#x4F46;&#x662F;&#x8868;&#x793A;&#x4E3A;&#x7A7A;        =&gt;&#x6709;&#x76D2;&#x5B50;&#x6CA1;&#x5185;&#x5BB9;&#xFF08;&#x5360;&#x636E;&#x7A7A;&#x95F4;&#xFF09;</p>
<p>null&#xFF1A;&#x7A7A;&#x503C;&#xFF08;&#x8FDE;&#x503C;&#x90FD;&#x6CA1;&#x6709;&#xFF09;            =&gt;&#x8FDE;&#x76D2;&#x5B50;&#x90FD;&#x4E0D;&#x5B58;&#x5728;&#xFF08;&#x4E0D;&#x5360;&#x7A7A;&#x95F4;&#xFF09;,&#x901A;&#x5E38;&#x7528;&#x4F5C;&#x91CA;&#x653E;&#x4E0D;&#x9700;&#x8981;&#x7684;&#x6570;&#x636E;</p>
<pre><code>String / Number / Noolean / Null / Undefined &#x90FD;&#x662F;&#x7B80;&#x5355;&#x7C7B;&#x578B;
</code></pre><p>5.Object &#x662F;&#x5F15;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x590D;&#x6742;&#x7C7B;&#x578B;&#xFF09;</p>
<pre><code>    // &#x5BF9;&#x8C61;
    var obj = new Object();
    var person = {
        name : &quot;&#x5F20;&#x4E09;&quot;,
        age : 18,
        rank : undefined,
        body : {
            tall : 180,
            xxx : 180
        }
    }
    //&#x6570;&#x7EC4;
    var arr = [1,2,3,4,5];    //&#x5F3A;&#x8C03;&#x6570;&#x636E;&#x7684;&#x987A;&#x5E8F;

    // &#x51FD;&#x6570;
    // &#x51FD;&#x6570;&#x58F0;&#x660E;
    function fun(){
        console.log(&quot;&#x8C03;&#x7528;&#x51FD;&#x6570;&quot; + num);
    }
    // &#x51FD;&#x6570;&#x8C03;&#x7528;&#xFF1A;&#x51FD;&#x6570;&#x540D;&#xFF08;&#x53C2;&#x6570;&#xFF09;
    fun();
</code></pre><h3 id="&#x7B80;&#x5355;&#x7C7B;&#x578B;&#x548C;&#x5F15;&#x7528;&#x7C7B;&#x578B;&#x7684;&#x533A;&#x522B;">&#x7B80;&#x5355;&#x7C7B;&#x578B;&#x548C;&#x5F15;&#x7528;&#x7C7B;&#x578B;&#x7684;&#x533A;&#x522B;</h3>
<p>&#x53D8;&#x91CF;&#x4FDD;&#x5B58;&#x7684;&#x662F;&#x5730;&#x5740;&#x7684;&#x4F4D;&#x7F6E;</p>
<p>&#x4E3A;&#x4E86;&#x8282;&#x7701;&#x5185;&#x5B58;&#x7A7A;&#x95F4;&#xFF0C;&#x5F15;&#x7528;&#x7C7B;&#x578B;&#x5B58;&#x653E;&#x5728;&#x5806;&#x5185;&#x5B58;</p>
<p>&#x5982;&#x679C;&#x6211;&#x4EEC;&#x8981;&#x628A;&#x5BF9;&#x8C61;&#x7684;&#x503C;&#x5B8C;&#x5168;&#x62F7;&#x8D1D;&#x51FA;&#x6765;&#x8981;&#x4F7F;&#x7528;&#x6DF1;&#x62F7;&#x8D1D;&#x7684;&#x65B9;&#x5F0F;</p>
<p>&#x603B;&#x7ED3;&#xFF1A;&#x7B80;&#x5355;&#x7C7B;&#x578B;&#x5B58;&#x7684;&#x662F;&#x503C;&#xFF0C;&#x5B58;&#x653E;&#x5728;&#x6808;&#x5185;&#x5B58;&#x91CC;&#xFF0C;&#x62F7;&#x8D1D;&#x7684;&#x65B9;&#x5F0F;&#x662F;&#x503C;&#x7684;&#x62F7;&#x8D1D;&#xFF1B;&#x5F15;&#x7528;&#x7C7B;&#x578B;&#x5B58;&#x653E;&#x7684;&#x662F;&#x5730;&#x5740;&#xFF0C;&#x5B58;&#x653E;&#x5728;&#x5806;&#x5185;&#x5B58;&#x91CC;&#xFF0C;&#x62F7;&#x8D1D;&#x7684;&#x65B9;&#x5F0F;&#x662F;&#x5730;&#x5740;&#x7684;&#x62F7;&#x8D1D;&#xFF1B;</p>
<pre><code>    var lisi = {
        name : &quot;&#x674E;&#x56DB;&quot;,
        age : 18,
        rank : undefined,
        body : {
            tall : 180,
            xxx : 180
        }
    }
    var wangwu = lisi;
    lisi.name = &quot;&#x738B;&#x4E94;&quot;;
    console.log(lisi,wangwu);

    var num1 = 123;
    var num2 = num1;
    num1 = 456;
    console.log(num1,num2);
</code></pre>
                    
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